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Counter-current acid leaching process for copper azole treated wood waste.

Janin, Amélie; Riche, Pauline; Blais, Jean-François; Mercier, Guy; Cooper, Paul A.; Morris, Paul (2012). Counter-current acid leaching process for copper azole treated wood waste. Environmental Technology , vol. 33 , nº 18. p. 2111-2118. DOI: 10.1080/09593330.2012.660648.

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Résumé

This study explores the performance of a counter-current leaching process (CCLP) for copper extraction from copper azole treated wood waste for recycling of wood and copper. The leaching process uses three acid leaching steps with 0.1 M H₂SO₄ at 75°C and 15% slurry density followed by three rinses with water. Copper is recovered from the leachate using electrodeposition at 5 amperes (A) for 75 min. Ten counter-current remediation cycles were completed achieving≥94% copper extraction from the wood during the 10 cycles; 80–90% of the copper was recovered from the extract solution by electrodeposition. The counter-current leaching process reduced acid consumption by 86% and effluent discharge volume was 12 times lower compared with the same process without use of counter-current leaching. However, the reuse of leachates from one leaching step to another released dissolved organic carbon and caused its build-up in the early cycles.

Type de document: Article
Mots-clés libres: copper azole; wood waste; treated wood; leaching; copper
Centre: Centre Eau Terre Environnement
Date de dépôt: 19 oct. 2018 14:43
Dernière modification: 19 oct. 2018 14:43
URI: http://espace.inrs.ca/id/eprint/7255

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